Add multi-thread support

CMakeLists.txt

@@ -1,12 +1,23 @@
 cmake_minimum_required(VERSION 3.11)
 
-set(CMAKE_C_STANDARD 99)
+set(REFCOUNT_USE_THREADS
+    ON
+    CACHE BOOL "Weather or not RefCount should be thread aware.")
+
+if(REFCOUNT_USE_THREADS)
+  set(CMAKE_C_STANDARD 11)
+else()
+  set(CMAKE_C_STANDARD 99)
+endif()
 
 project(
   refcount
   VERSION 1.0
   LANGUAGES C)
 
+# For configuring config.h (I like this name better)
+set(REFCOUNT_HAS_THREADS "${REFCOUNT_USE_THREADS}")
+
 include(FetchContent)
 FetchContent_Declare(
   ht
@@ -19,13 +30,17 @@ if(CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME)
   include(CTest)
 endif()
 
-add_compile_options(-fsanitize=address,leak,undefined)
-add_link_options(-fsanitize=address,leak,undefined)
+# add_compile_options(-fsanitize=address,leak,undefined)
+# add_link_options(-fsanitize=address,leak,undefined)
+
+configure_file(include/refcount/config.h.in include/refcount/config.h @ONLY)
 
 add_library(refcount src/allocator.c src/list.c src/refcount.c)
 target_link_libraries(refcount PUBLIC ht)
 target_include_directories(refcount PUBLIC include/)
 target_compile_options(refcount PRIVATE -Wall -Wpedantic)
+target_include_directories(refcount
+                           PUBLIC "${CMAKE_CURRENT_BINARY_DIR}/include")
 
 if(CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME AND BUILD_TESTING)
   add_subdirectory(test/)